[3.10] dataclasses.rst: Prevent horizontal scrolling (gh-100025). (gh-100029)

(cherry picked from commit 51ee0a2)

Co-authored-by: Ram Rachum <ram@rachum.com>

Co-authored-by: Ram Rachum <ram@rachum.com>

Author: ericvsmith

Doc/library/dataclasses.rst

@@ -79,7 +79,8 @@ Module contents
      class C:
          ...
 
-     @dataclass(init=True, repr=True, eq=True, order=False, unsafe_hash=False, frozen=False, match_args=True, kw_only=False, slots=False)
+     @dataclass(init=True, repr=True, eq=True, order=False, unsafe_hash=False, frozen=False,
+                match_args=True, kw_only=False, slots=False)
      class C:
         ...